That is a piranha, right? So much for the super-violent image! Probably isn't typical, though. What do you feed them?

Funny story;

It was sold to me as a silver dollar (I didn't know any better, it was my first tank) and as he grew, the colors became more pronounced. From what I've discerned, he's a red belly pacu. I'm not totally sure because he's only grown to about 5.5" in length and not the large size that pacu's are known for.

His current diet consists of flakes and pellets, but I'm starting to try other foods (vegetation of sorts). He definately prefers the pellets over flakes though, which the gourami won't touch. Also, occasionaly, I'll throw in a few feeders for them to play with

As for aggression, it's definately there. If it weren't for the gourami, he wouldn't have any tankmates.